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Ground Deformation during Papandayan Volcano 2002 Eruption as Detected by GPS Surveys Abidin, Hasanuddin Z.; Andreas, H.; Gamal, M.; Sugandar, Ony K.; Meilano, Irwan; Hendrasto, M.; Kusuma, M. A.; Darmawan, D.; Purbawinata, M. A.; Wirakusumah, A. D.; Kimata, F.
Journal of Engineering and Technological Sciences Vol 35, No 1 (2003)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2964.335 KB) | DOI: 10.5614/itbj.eng.sci.2003.35.1.4

Abstract

Papandayan is an A-type active volcano located in the southern part of Garut Regency, about 70 km southeast of Bandung, Indonesia. Its earliest recorded eruption, and most violent and devastating outburst occurred in 1772 and the latest eruptions occurred in the period of 11 November to 8 December 2002, and consisted of freatic, freatomagmatic and magmatic types of eruption.During the latest eruption period, GPS surveys were conducted at several points inside and around the crater in a radial mode using the reference point located at Papandayan observatory around 10 km from the crater. At the points closest to the erupting craters, GPS displacements up to a few dm were detected, whereas at the points outside the crater, the displacements were in the cm level. The magnitude of displacements observed at each point also show a temporal variation according to the eruption characteristics. The results show that deformation during eruption tends to be local, e.g. just around the crater. Pressure source is difficult to be properly modeled from GPS results, due to limited GPS data available and differences in topography, geological structure and/or rheology related to each GPS station.
Estimation of Slip Distribution of the 2007 Bengkulu Earthquake from GPS Observations Using the LeastSquares Inversion Method Awaluddin, Moehammad; Meilano, Irwan; Widiyantoro, Sri
Journal of Engineering and Technological Sciences Vol 44, No 2 (2012)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (579.484 KB) | DOI: 10.5614/itbj.eng.sci.2012.44.2.6

Abstract

Continuous  Global  Positioning  System  (GPS)  observations  showed significant  crustal  displacements  as  a  result  of  the  Bengkulu  earthquake occurring on September 12, 2007. A maximum horizontal displacement of 2.11 m was observed at PRKB station, while the vertical component at BSAT station was lifted up with a maximum of 0.73 m, and the vertical component at LAIS station had subsided  –0.97 m. Adding more constraints on the inversion for the Bengkulu earthquake slip distribution inferred from GPS observations can help solve  the  underdetermined  least-squares  inversion.  Checkerboard  tests  were performed  to  help  conduct  the  weighting  for  constraining  the  inversion.  The inversion calculation yielded an optimal value for the slip distribution by giving the smoothing constraint a weight of 0.001 and the slip constraint a weight of = 0 at the edge of the earthquake rupture area. The maximum co-seismic slip of the optimal inversion calculation was 5.12 m at the lower area of PRKB station and BSAT station. The seismic moment calculated from the optimal slip distribution was 7.14 x 1021 Nm, which is equivalent to a magnitude of 8.5.
Tectonic Strain in Sumatera Based on Continuous Sumatran GPS Array (SuGAR) Observation 2007-2008 Rino, Rino; Meilano, Irwan; Hilman Natawidjaja, Danny
Indonesian Journal of Geospatial Vol 1, No 2 (2012)
Publisher : Indonesian Journal of Geospatial

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Abstract

Abstract. Sumatra is located near the place where the collision between Indo-Australian Plate and Eurasian Plate heppened. When Indo-Australian Plate moves below Eurasian Plate, the friction that occur between both plates causes the strain is being accumulated. The strain that exceeds the elastic limit will be released as an earthquake. GPS observation in Sumatra was conducted to analyse the velocity of vector displacement and the heterogenous of tectonic strain on the surface as one of the tectonic indication to earthquake mitigation in the future. The result from data processing shows vector displacement in Sumatra has northeast direction that indicate inter-seismic and southwest direction that indicate post-seismic. The strain distribution is extension that indicate post-seismic equally scatteres dominantly in zone where happened Aceh earthquake on 2004, Nias earthquake on 2005, Bengkulu on Sptember 12th 2007, and earthquake on Mentawai Island on September 13th 2007. While strain as compression shows Sumatera still has inter-seismic effect.Keywords: compression, earthquake, extension, GPS.
Analisis Deformasi Gunung Api Papandayan Berdasarkan Data Pengamatan GPS Tahun 2002 – 2011 Jamel, Ilham; Meilano, Irwan; Gumilar, Irwan; Anggraeni Sarsito, Dina; Z. Abidin, Hasanuddin
Indonesian Journal of Geospatial Vol 2, No 2 (2013)
Publisher : Indonesian Journal of Geospatial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.433 KB)

Abstract

Abstrak. Gunung api Papandayan adalah gunung api yang terletak di Kabupaten Garut, Jawa Barat. Gunung api dengan ketinggian 2665 meter di atas permukaan laut itu terletak sekitar 70 km sebelah tenggara Kota Bandung. Gunung api Papandayan merupakan salah satu gunung api aktif di Indonesia. Salah satu metoda pemantaun aktivitas vulkanik gunung api adalah dengan metoda deformasi. Dalam melakukan penelitian deformasi yang terjadi, digunakan data pengamatan survei GPS (Global Positioning System). Pada dasarnya survei ini dilakukan untuk mengetahui pola dan kecepatan deformasi yang terjadi pada Gunung api Papandayan. Dari analisis unsur deformasi ini, dapat diketahui karakteristik deformasi yang terjadi pada gunung api tersebut. Pada Gunung api Papandayan deformasi yang terjadi dipengaruhi oleh tekanan magma dari dalam gunung. Dari analisis yang dilakukan, sumber magma dalam dan sumber magma dangkal mempengaruhi aktivitas gunung. Pada tahun 2003-2005 terdapat dua sumber magma dimana di sana terjadi proses inflasi. Pada tahun 2005-2008 hanya satu sumber yang mempengaruhi dimana di sana terjadi proses deflasi. Pada tahun 2008-Juli 2011 terdapat dua sumber  magma yang mempengaruhi dimana di sana terjadi proses deflasi dan inflasi. Pada Juli 2011-Agustus 2011 terdapat satu sumber magma dimana di sana terjadi proses inflasi. Pada tahun 2003-Agustus 2011 terdapat dua sumber magma dimana di sana terjadi proses deflasi dan inflasi.Kata Kunci : Survei GPS, deformasi, model Mogi 
Continuous GPS Time Series Data Analysis in Sumatera; Case of Study: Continuous Data SuGAR (Sumatran GPS Array) 2004-2007 Leila Hanief, Sarah; Meilano, Irwan; Darmawan Wijaya, Dudy
Indonesian Journal of Geospatial Vol 1, No 2 (2012)
Publisher : Indonesian Journal of Geospatial

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Abstract

Abstract. In each GPS time series data, there are signals which exist and affect the result that has been received, which is called noise. Those noise components will form certain pattern in time series. Basically, time series has periodic component which commonly not being able to be detected directly. To detect which periodic component that dominantly affect the time series, there is a way which is called spectral analysis. With acknowledge periodic component in a time series, we can know the characteristic of the time series and then we can determine how many parameters will be needed to do curve fitting. There are two approximations in fitting, it is either linear fitting only or linear fitting with including periodic component. As a comparison between these two methods, we need to be estimate displacements velocity rate in a year. From the analysis that has been done, the result is that the biggest difference of displacements velocity rate between these two methods is 3.7 milimeters per year.Keywords: displacements velocity rate, fitting, periodic component, spectral analysis, time series.
Analisis Metode GPS Kinematik Menggunakan Perangkat Lunak RTKLIB Kuncoro, Henri; Meilano, Irwan; Anggraeni Sarsito, Dina
Indonesian Journal of Geospatial Vol 2, No 2 (2013)
Publisher : Indonesian Journal of Geospatial

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Abstract

Abstract. One of the GPS kinematic processing software that developed in the current is RTKLIB. RTKLIB is the software which people can downloaded free and used free for it. This software can also perform data processing in fast and the data processing can be integrated in post-processing and real-time. In this study, the ability of RTKLIB tested by using GPS observation data with variations of the baseline length when earthquake not occured and earthquake offset detection from the GPS baseline processing results during earthquake. In this testing the stability of the GPS data processing results are ascertainable and it can be seen also the ability and reliability of the software in detecting earthquake offset. For comparison of the data processing results quality with RTKLIB, in this study selected TTC (Trimble Total Control) to process the GPS baseline of the same observasions From the results of GPS baseline processing with RTKLIB and TTC, it seems that RTKLIB results have better stability than TTC. In short baseline category have standard deviation less than 1 cm, in medium baseline category have standard deviation between 3-6 cm, whereas in long baseline category have standard deviation 3-8 cm. On the offset detection of earthquake, RTKLIB have ability to detect offset in more of baseline length variations than the TTC. Kata Kunci: GPS Kinematik, Offset Gempa, RTKLIBAbstract. One of the GPS kinematic processing software that developed in the current is RTKLIB. RTKLIB is the software which people can downloaded free and used free for it. This software can also perform data processing in fast and the data processing can be integrated in post-processing and real-time. In this study, the ability of RTKLIB tested by using GPS observation data with variations of the baseline length when earthquake not occured and earthquake offset detection from the GPS baseline processing results during earthquake. In this testing the stability of the GPS data processing results are ascertainable and it can be seen also the ability and reliability of the software in detecting earthquake offset. For comparison of the data processing results quality with RTKLIB, in this study selected TTC (Trimble Total Control) to process the GPS baseline of the same observasions From the results of GPS baseline processing with RTKLIB and TTC, it seems that RTKLIB results have better stability than TTC. In short baseline category have standard deviation less than 1 cm, in medium baseline category have standard deviation between 3-6 cm, whereas in long baseline category have standard deviation 3-8 cm. On the offset detection of earthquake, RTKLIB have ability to detect offset in more of baseline length variations than the TTC. Kata Kunci: GPS Kinematik, Offset Gempa, RTKLIB 
Review System Geodetic Reference In Some Countries Andreas, Heri; A. Sarsito, Dina; Meilano, Irwan
Indonesian Journal of Geospatial Vol 2, No 1 (2013)
Publisher : Indonesian Journal of Geospatial

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Abstract

Abstract. Two important things in the scope of Geodesy and Geomatics engineering and geodetic science is positioning and coordinates. The position is defined simply as the existence of an object to other objects , while the coordinate is defined as a position statement quantitatively , or others mentioned in the definition of the coordinates is a quantity (numerical) to declare the location or position of a point (object) in a chamber (field) . To ensure consistency and standardization of a coordinate , which applies to the local system to the global (world) , it is necessary to declare the existence of a coordinate system . This system is called the coordinates reference system or Geodetic Reference System , with elements of a constituent or parameter consist of Reference Frame and coordinates Reference System on the earths static system , and the reference system , coordinates and Datum Reference Frame coordinates on the earths dynamic systems . Datum Coordinates further divided into several types of Datum Static, Semi Dynamic , Dynamic , Semi Kinematic and Kinematic .What Geodetic Reference System which is generally used in the global scope ( the world ) will be discussed in this paper . Hope this theme can be one basis when we as a community of Geodesy and Geomatics , or even national community select or determine what the true Geodetic Reference System . This paper will also discuss specifically Geodetic Reference System in several countries . Keywords : Positioning, Coordinate, Geodetic Reference System, Coordinate Datum
INVESTIGATION OF THE SOLID EARTH TIDE BASED ON GPS OBSERVATION AND SUPERCONDUCTING GRAVIMETER DATA Pahlevi, Arisauna Maulidyan; Prijatna, Kosasih; Meilano, Irwan; Sofian, Ibnu
GEOMATIKA Vol 22, No 1 (2016)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1161.416 KB) | DOI: 10.24895/JIG.2016.22-1.488

Abstract

According to Zheng (2006), vertical displacement caused by the solid earth tide often reaches in range 20 cm, and can exceed 30 cm in some stations. To measure solid earth tide we can use satellite system or sensitive gravimeters (Ito et al., 2009). This paper aims to investigate solid earth tide based on Global Positioning System (GPS) data compare with Superconducting Gravimeter (SG) data and solid earth tide global model. Processing GPS data using Kinematic Precise Point Positioning (KPPP) method within a year data from 1st January – 31st December 2011. We use BAKO GPS Permanent station data and Cibinong SG Station data. The location of BAKO station is close to Cibinong SG station, which is about 50 meters. The result of this paper are solid earth tide which is derived from both devices have the same pattern, and it is dominated by semi-diurnal components. Applicability global models with SG observations has smaller residue with standard deviation is 0.0031 mgal, this result is equivalent with 0.0098 meter. Comparison between the results of GPS observations to global models which have a standard deviation residue for vertical component is 0.0360 meters.
Interseismic Slip Distribution Analysis in East Java Ramdhani, Bagoes Dwi; Meilano, Irwan; Gunawan, Endra
Indonesian Journal of Geospatial Vol 5, No 1 (2018)
Publisher : Indonesian Journal of Geospatial

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Abstract

We reexamined GPS stations in Eastern part of java to understand the recent deformation from the convergence zone between the Australian Plate and Sunda Block in East Java. From the seismic record in the subduction zone shown the occurrence of tsunami earthquake in M7.7 in 1994 and several number of earthquakes that potentially become tsunami. To comprehensively obtain the signal in subduction zone, we have to remove the effect of the other major sources deformation in the area of study, as in this study is the block motion from Sunda Block. To remove the block motion of Sunda Block we used the parameters of the model Altamimi (2007) in the GPS field. The used data for this research is several campaign GPS and Continuously GPS data from 2010 – 2016. These data processed using GAMIT/GLOBK 10.6 software to obtain geocentric coordinates, geodetic coordinates, and standard deviation which reference to ITRF2000. Geocentric coordinates are transformed into topocentric coordinates to know the rate of shift vector speed. From the obtained displacement rate, carried reduction to clean up from other deformation source. The value of surface deformation is made as input for the inversion calculation from dislocation theory in half space by Okada (1992). The result show the strong slip distribution in the two sides of fault model that located near the costal of Pacitan and the in the south of Banyuwangi, this slip distribution represent the coupling from the convergence zone. It indicates there are accumulating energy due to convergence of the megathrust. The comparison of surface deforomation from forward calculation and the GPS observation are nearly similar which indicated by the value of rms residual is ± 2.06 mm. However from the model accuracy and resolution found that model contain misfit in dependent location. From this research, we highlight the value of slip distribution correlating to the risk assessment in Java Island.
Akumulasi Regangan di Sumatera Berdasarkan Data Pengamatan GPS Tahun 2002-2008 dan Dampak Kerusakan Lingkungan Akibat Pelepasan Regangan Maiyudi, Riko; Meilano, Irwan; Sarsito, Dina
Jurnal Rekayasa Hijau Vol 1, No 2 (2017)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Institut Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1499.693 KB) | DOI: 10.26760/jrh.v1i2.1630

Abstract

ABSTRAKPulau Sumatera terletak di antara dua lempeng tektonik yaitu lempeng Indo-Australia dan lempeng Eurasia. Intensitas gempa bumi sangat besar di pulau ini, terutama di sepanjang daerah pesisir barat. Pada 2002-2008 periode, banyak gempa bumi besar yang menyebabkan korban jiwa dan kerusakan lingkungan. Fenomena ini menunjukkan bahwa studi tentang pola deformasi pulau Sumatera sangat diperlukan. Studi yang diperlukan adalah untuk rencana mitigasi bencana di masa depan. Pola deformasi gempa dapat diamati dengan GPS pengamatan (Global Positioning System). Data yang digunakan untuk gempa Sumatera adalah GPS Sumatera Array (SuGAr). Perangkat lunak yang digunakan untuk data Array GPS Sumatera dari pulau Sumatera adalah Gamit 10.4. Dari hasil pengolahan data, dapat disimpulkan bahwa data perpindahan koordinat stasiun dapat digunakan jika data outlier telah terhapus. Dari koordinat perpindahan stasiun bisa diperoleh vektor perpindahan semua stasiun sebelum, selama atau setelah gempa bumi. Dari perpindahan nilai-nilai vektor, nilai regangan yang terjadi di sepanjang pulau Sumatera dapat diperkirakan. Dari data regangan, nilai akumulasi regangan 2002-2008 dapat diperoleh. Sehingga dapat dianalisis wilayah yang berpotensi terjadinya gempa selanjutnya.Kata Kunci: Akumulasi Regangan , Deformasi, Kerusakan Lingkungan, ABSTRACTThe Sumatra Island is located between two tectonic plates; the Indo-Australia Plate and the Eurasian plate. The intensity of the earthquakes is very large on the island because of this, especially along the western coastal area. On the 2002 to 2008 period, many large earthquakes that caused casualties and damage to the environment. These phenomena shows that the studies of the deformation patterns of the Sumatra island is required. The studies are required for disaster mitigation plans in the future. The deformation patterns of the earthquake can be observed with GPS (Global Positioning System) observation. The data that is being used for Sumatra earthquake is the Sumatran GPS Array. The software that is used for the Sumatran GPS Array data of the Sumatra Island is the Gamit 10.4. From the data processing, it can be concluded that there are displacements of the nations can be used if the outlier data has been erased. From the station displacement coordinates, we can obtain the displacement vector of all of the station before, during or after the earthquakes. From the displacement vector values, the values of the strain that occurs along the Sumatra Island can be estimated. From the strain data, the accumulated value of strain from 2002 to 2008 can be obtained. Finally it can be predicted potential area for next earthquake.Keywords: Keywords: Deformation, Environmental Damage, Accumulated Strain.